Small block crankshaft endplay

If you're going to just use the drivetrain as-is, sure, give the 727 a try. Personally, I'd rather keep the 904 and beef it up a bit along with getting the proper converter for the 360 and warming over the 360 a bit. That way, I'd save money on not having to get a new driveshaft and put that money toward the converter and engine mods. The 904 is a better performance and mileage transmission than the 727 (when built properly), and it's lighter to boot.